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For precipitation to form, something is needed to force the air to rise.
Warm air overrunning is the most common process in the production of
freezing rain. This occurs as
warm air rides up and over colder air, (as in the animation above),
the water vapor condenses, producing clouds and
precipitation. When the precipitation falls through an atmosphere
with a temperature profile
similar to the one described above,
freezing rain is a likely
result.